Combined dust-ridding and sand-reclaiming shield



Aug. 29, 1950 A. A. DICK 2,520,627

COMBINED DUST-RIDDING" AND SAND-RECLAIMING SHIELD Filed Aug. l, 1947 Patented Aug. 29, 1950 UNITED lSTATE s PATENT OFFICE ooMINEn DUST-BIDDINGAND SAND- Y RECLAIMING SHIELD This invention relates to a combined .dustridding and sand-reclaiming shield.

The primary purpose and object of this invention is to enable a. user to clean or abrade the surface of a black-board or other substantially vertical surface with a sand-blast without filling the adjacent air with dust and without wasting sand or covering the adjacent 'floor and other objects with the sand that has been used in the sand-blast.

Another object is to provide means to conduct the dust away from the place of operation, to any appropriate place of disposal, andyto provide appropriate means to catch the used sand in a movable receptacle for use over and over inthe I sand-blast.

Another object is to provide windows and light'- entrances, so the user can watch the result of the sand-blast as he directs it to all points'withi'n the scope of the shield at each of its different adjustedrpositions. Y n

Another object is to provide the shield with resilient or conformable lining-portions that project beyond the walls free edges, so they can be pressed against the surface to be cleaned or 4 abraded, thereby to prevent escape of dust or sand past the said free edges. v

Another object is to provide the shield with a sand-outlet whose margin is of rubber or other conformable material, and which normally extends down into a sand-recovering vessel and conforms to the inner-upper surface of the latter so as to prevent escape of dust past said upperinner surface. v

Another object is to provide a wheel-supported frame for supporting the shield and facilitating its easy sliding adjustment to various points of the surface to be cleaned or abraded.

Another object is to provide the front wall of the shield with a conformable element having a hand-hole therethrough so it conforms to the wrist of the user whose hand holds and manipulates the sand-blast nozzle within the shield; thereby to prevent dust from escaping through the hand-hole.

Other objects and important features are pointed or implied in the following details of description in connection with the accompanying drawings in which:

Fig. 1 is a front view of a floor-supported form of the shield and its supporting frame in proper position to shield a part of the black-board, parts of the dust-conducting pipe, sand-receiving vessel and the black-board, being broken away.

Fig. 2 is a central vertical sectional view along the line 2-2 of Fig. 1, a part of the cushion-lining 3 Claims. (Cl. 51-8) 2 being broken out to show a portion of the adjacent metal part of the side-wall. y

Fig. 3 is an enlarged sectional view of the conformable inlet-element or hand-hole element Aand its adj uncts. Referring to these drawings in detail, in which, similar reference numerals and letters refer to 'similar parts throughout the several views, the ,invention is described in detail as follows;

' In broad terms, the invention comprises a shield or receiver that comprises a front wall 'I having therethrough an entrance-elementv 'Ie .adapted to receive a sand-blast nozzle or a users hand which'manipulates the said nozzle, side,- walls 8 fhaving front-edges hermetically united with said front-wall at opposite sides of the entrance-element le, a bottom-Wall 9 anda topwall I0 each having front and lateral edges hermetically united with said front-wall and sidewalls at II, said sidewalls and bottom-wall and top-wall having free vconformable rear edges I2 substantially in a common upright plane and adapted to beheld against and slid along a blackboard or 'other plane upright surface S to be cleaned by a blast of sand and air through said entrance-element and directed at different parts ofV said surface, a dust-outlet-pipe I3 in open communicationwith the upper portion of said receiver, said bottom-wall having a depression yIll to'assist in trapping sand to be used over and over in the sand-blast, Said front wall 'I having a'hermetic window through which a user can yseethe surfacebeing cleaned or abraded.

The entrance-element 'Ie comprises a sheet of rubber or lother conformable material having therethrough a relatively small opening Io through lwhich a sand-blast-nozzle or .a yusers h'andcan be' forced into said receiver, the' conformable material of said entrance-element being adapted to contract around the object forced therethrough, thereby to prevent escape of dust through said entrance-element during sand-blas operations.

In Figs. 1 and 2, the depression I4 vhas a sandoutlet |40 at its lower end, and a movable imperforate receptacle I5 is normally in open communication with said sand-outlet and hermetically connected thereto by a conformable endless edgeportion Me, fitting in the upper end of the receptacle I5 so as to prevent escape of dust between said sand-outlet and movable receptacle.

Inner portions of the receiver are composed of rubber or other cushioning material I9 that resists abrasion by accidental contact with the sand-blast during operation thereof.

In Figs. 1 and 2, the supporting frame 20 in- Vrzeitiarit because of. tri S with ' ter sufficiently above said horizontal portion'to permit said receptacle I5 to be slid on said hori- Zonta] portion into and out of hermetic engagement with said sand-@outlet I da, Y

The sfiipeetine Ineens or frame. i is metida@ with Wheels 28u) to roll on an extrinsic support While said receiver` is being slid along the surface y being sand-blasted.

In Figs. 1 and 2, the Wheels4 roll on the flogg- F; l Handle 1h is provided on the front-Wallerv the shield or receiver, so the operator can use handle for pressing the guard or receiver against the surface being cleaned or abraded, and-ier rolling the device along the iioor.

A window Si, or light-.opening can "De provided v inreitner er bath Sider..valle-if4 'liie nisovisiem and positions of these iiehiaeiitranees el.' is. irnhadevv that` the operator aereas the. iront windew 1w...

The Yprotective linings 'inay be applied; 129. @like i ndvv .en maniniilates the.. saidiieazleh si Walls having firent-e espiiermeiieallv united. with S el .a botieiiivvaii and. top vvali. each h .t and lateral. eiiaeshermevieallv u Sad rient-.Wall and: Side-vv'allal said. si e f. wahsaga boite ,.-waii'anci renewal, hating. free. conformable real: edges Substantially in' a. eem-l 10.11 upright. plane, and adapted tohelneld against a .d slid alena a. biaekfb 1 0r,..eiher Platte, righi suriae te be ele d. by a iiiasiIV Qi sand V and'air ihrougn san entrance-.element am eeied at different parts'ef. Said. surfaced said. re.-r

ai@ rrorrtwail; at, on Sitesideeof. 'said entrance 4 ceiver having a sand-outlet at its lower end, and a. removable imperforate receptacle normally in open communication with said sand-outlet and hermetically connected thereto so as to prevent escape of dust from said receptacle or from between the latter and the sand-outlet.

2.V The combination dened by claim l, and a supnertina trame.. that, malades a, horizontal p0radaieteri; te! Submit. said receptacle Said frame comprising legs having their wpper portions `gnited with said receiver and supporting the latter sufficiently above said horizontal portion tornernfiitsaid receptacle to be slid on said horizontalp'ortion into and out of hermetic engagement said sand-outlet.

3. In combination, a supporting frame having a lower end that'is free from a iioor or other substantially level surface on which it is adapted to loe supported for movement thereon, said frame incisilime ax shelf abeve. said, lower emi and Cie. a proper. relation neiY a Shield. that irilises a. freni wail hav- ,v element adapted. to refeive. a sand-@Last matie aride/0.1? a iisersV hand that' maiinulates said iiezeie. said Ysnielci. having e prisms irontedees iiermeiieaiiv in ed vvith. Said' iront, wallat. opposite sides. of said entrance-element;'saidshield having a bili?,- temewali and. a. tea-valt, Said. side-walls and; hoi'- teirifwall. and' ten. vvall having free. eexnformable rear e ges'siibsialiiellv a common upright plane and adapted to. be held against and. slid alena 'aL blaefbaard te. be. eleaneil by. a blast of sar'ld'andv 'air thru said entrance element. and. Ctireeieii.- against diiereat parte Qi. said. lelaeklieard, Sai@ receiver having an'entiet. above said shelf am@ @Willa @Die @Pei 'Raft 0f Said. Supporting eine united, with. its. Leaver., end-portion. ifi. a proper relation to communicate said outlet, with saisi ieceniaelewhenthe latter is onr said'shelf.

" ARTHUR, a. DICK,

adapted to holdI a. recep 'Eliafieliewiiief iereiiees are @i veeerd. in.v the file Yof this patent:

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